Collection接口和常用方法2

方法2：

增强for循环：可以代替iterator迭代器

特点：增强for就是简化版的iterator，本质一样，只能用于遍历集合或者数组

基本语法：

　　for(元素类型 元素名：集合名或数组名){

　　　　访问元素

　　}

public class CollectionMethod2 {
    @SuppressWarnings({"all"})
    public static void main(String[] args) {
        Collection col = new ArrayList();
        col.add(new Book("三国演义","罗贯中", 19.9));
        col.add(new Book("小李飞刀","古龙", 59.9));
        col.add(new Book("红楼梦","曹雪芹", 9.9));

        //使用增强for循环
        //增强for也可以直接对数组使用
        //增强for底层还是迭代器
        //快捷方式I
        for(Object book : col){
            System.out.println(book);
        }
        
    }
}

class Book{
    private String name;
    private String author;
    private double price;

    public Book(String name, String author, double price) {
        this.name = name;
        this.author = author;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Book{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                '}';
    }
}